black leadWiktionary 原文英美词源说明In the sense of lead, calque of Latin plumbum nigrum (“lead”, literally “black lead”).释义名词noun1now historicalThe metal lead. [from 14th c.]2Graphite, especially as used in pencils. [from 16th c.]3countableA graphite pencil.4now historicalA type of polish made from graphite, used for kitchen cleaning and blackening grates. [from 19th c.]